FORUMS
Remove All Ads from XDA

Kernel downgrade method for EU/BR/AR Gingerbread (only for BL=3)

972 posts
Thanks Meter: 414
 
By Endless7, Senior Member on 14th February 2012, 06:17 PM
Post Reply Email Thread
First,you must have version 3 BL. As I known, all EU gb have version 3 and BR/AR gb (except for persona&vivo,which is 4) too. Or you can use this tool(attachment) to check the version of CG31 in the sbf you have flashed.

After you confirm you have v3 BL,download this downgrade sbf from attachment and use RSD to flash it to your phone.Once you have done,you will have the new chinese 45.1.5 gb kernel(your BL is still 3,because this version can never be downgraded).Note!If you just want to use MIUI/CM7 based on froyo kernel, the downgrade job is already done here and you don't need to do the following steps. What you need to is just following the installation tuturial of MIUI/CM7).

Because the bootloader also check version of /system(CG39).so the original steps would not work.
Now,you already have the ability to flash the lower version sbf or said BL=2 sbf generally.But the sbf itself need to modified a bit. Download MotoAndroidDepacker from attachment and follow the following step:
1.open MotoAndroidDepacker
2.click "Open from file" and select the sbf
3.click "Split to folder" and wait for it to finish
4.open the created folder and delete CG31.smg
5.back to MotoAndroidDepacker
6.click "Open files folder" and select the created folder
7.click "Compile file" and wait for it to finish
8.now,you will get a firmware.sbf in the created folder
Now you can use RSD to flash this sbf and get a clean and complete ROM,which could be official froyo or Chinese old gingerbread 45.1.3.


New method:
1.read the steps above and know how to edit sbf
2.find an nandroid backup of froyo system
3.restore it via clockwork recovery
4.open an froyo sbf and remove CG31/CG39 and repack it
5.flash it via RSD
6.reboot your phone
Now you will go back to froyo again.




Why it works:
Recently, China Moto release a new sbf for milestone2: 2.3.4-4.5.3-109_MS2-5-111219
password: bbs.dkdiy.net
the CG31/BL version of this sbf is also 3 but the key point is this new CG31/BL also contains signatures for older kernels( all froyo kernels&chinese gingerbread kernels ). If you don't want to download the whole sbf, the cg31,also cg35/61 are contained in the downgrade sbf.
Attached Files
File Type: rar smgver.rar - [Click for QR Code] (14.0 KB, 2053 views)
File Type: rar downgrade_for_bl=3.rar - [Click for QR Code] (3.04 MB, 16806 views)
File Type: rar MotoAndroidDepacker.rar - [Click for QR Code] (48.5 KB, 2390 views)
The Following 26 Users Say Thank You to Endless7 For This Useful Post: [ View ] Gift Endless7 Ad-Free
 
 
14th February 2012, 06:40 PM |#2  
Senior Member
Flag Hong Kong
Thanks Meter: 17
 
More
I'm sure this would be a pleasant piece of news for those who are stuck with GB. Thanks endless7.

Sent from my MotoA953 using XDA App
14th February 2012, 07:45 PM |#3  
Senior Member
New Delhi
Thanks Meter: 70
 
More
Thanks man!! Will give it a shot. I have been craving for CH GB kernel with no multitouch bug.

Edit: As you said, that those who want to install MIUI etc etc. can just flash those ROMs after using the downgrade sbf, so I'm guessing that once I flash the downgrade sbf I should be able to flash the CH GB kernel (only the kernel if I have a flashable zip of it) as well. Am I right in assuming that?

Edit2: Cool, it works. I'm on CH GB kernel now.
14th February 2012, 10:04 PM |#4  
Member
Thanks Meter: 14
 
More
Quote:
Originally Posted by Endless7


Now,you already have the ability to flash the lower version sbf or said BL=2 sbf generally.But the sbf itself need to modified a bit. Download MotoAndroidDepacker from attachment and follow the following step:
1.open MotoAndroidDepacker
2.click "Open from file" and select the sbf
3.click "Split to folder" and wait for it to finish
4.open the created folder and delete CG31.smg
5.back to MotoAndroidDepacker
6.click "Open files folder" and select the created folder
7.click "Compile file" and wait for it to finish
8.now,you will get a firmware.sbf in the created folder
Now you can use RSD to flash this sbf and get a clean and complete ROM,which could be official froyo or Chinese old gingerbread 45.1.3.

which SBF file i need to open with MotoAndroidDepacker?
14th February 2012, 11:50 PM |#5  
n3ptun3's Avatar
Senior Member
Thanks Meter: 49
 
More
Cool.. looks like I can go back to CM7 now heh finally
15th February 2012, 01:37 AM |#6  
Member
Thanks Meter: 9
 
Donate to Me
More
any way for those that made a stupid update for v4 roms ? =(
15th February 2012, 01:40 AM |#7  
Junior Member
Porto Alegre
Thanks Meter: 0
 
More
Very tanks.

Sent from my A953 using Tapatalk
15th February 2012, 02:44 AM |#8  
Senior Member
Thanks Meter: 11
 
More
I am unable to use the downgrade sbf on rsdlite 4.9
the file properties doesn't shown anything and start button is disabled.
to whoever successful with this, what version of rsdlite did you use?
Attached Thumbnails
Click image for larger version

Name:	rsd-DowngradeMilestone2.jpg
Views:	1044
Size:	34.7 KB
ID:	902415  
15th February 2012, 03:15 AM |#9  
Endless7's Avatar
OP Senior Member
Thanks Meter: 414
 
Donate to Me
More
Quote:
Originally Posted by alexyie

I am unable to use the downgrade sbf on rsdlite 4.9
the file properties doesn't shown anything and start button is disabled.
to whoever successful with this, what version of rsdlite did you use?

I think you need to update your RSD software to 5.0+
The Following User Says Thank You to Endless7 For This Useful Post: [ View ] Gift Endless7 Ad-Free
15th February 2012, 03:16 AM |#10  
Endless7's Avatar
OP Senior Member
Thanks Meter: 414
 
Donate to Me
More
Quote:
Originally Posted by oh0

which SBF file i need to open with MotoAndroidDepacker?

edit: downgrade sbf from attachment.
The Following User Says Thank You to Endless7 For This Useful Post: [ View ] Gift Endless7 Ad-Free
15th February 2012, 03:48 AM |#11  
Senior Member
Thanks Meter: 11
 
More
Quote:
Originally Posted by Endless7

I think you need to update your RSD software to 5.0+

Hi, I tried version 5.0, still cannot. I also downloaded version 5.6, but seems like cannot be installed on my laptop/pc with windows 7

EDIT: Managed to find a windows XP PC from my friend, all fine now using rsd lite v5.6. going to try flashing latest MIUI now.
tyvm Endless7 ^^
Post Reply Subscribe to Thread

Tags
downgrade gingerbread

Guest Quick Reply (no urls or BBcode)
Message:
Previous Thread Next Thread
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes